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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bf5b4a39ce45fb7c9afd7b6c4857b15718e1aa84c5d33bae9d7fdadc08aab2' 
  AND token = '+kDeeq/iETE0jy70pGcfFY6vByU7k9BqzsN4NmBO3PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}